The companies in separate letters to DoT and state authorities in addition to anonymous complaints to the Chief Vigilance Officer (CVO) and the Prime Minister Office (PMO) during the April-May period alleged the wrongdoings, saying that the state had put up restrictive conditions, aimed to benefit only a handful of large firms.

"There is no such requirement from DoT to provide source code from telecom gear makers," a senior official said, and added that it might be only a requirement of user agency for network products likely to be used for security-related initiatives.

The comeback is a sharp turnaround for billionaire Sunil Mittal after grueling competition with Ambani’s Reliance Jio Infocomm Ltd. knocked Airtel off its perch in the world’s second-biggest wireless market by users.

Chinese handset firms Oppo, Realme and OnePlus are finding it difficult to meet the pent-up demand in both online and bricks-and-mortar channels following the shutdown of the Oppo factory in Greater Noida.

The companies in separate letters to DoT and state authorities in addition to anonymous complaints to the Chief Vigilance Officer (CVO) and the Prime Minister Office (PMO) during the April-May period alleged the wrongdoings, saying that the state had put up restrictive conditions, aimed to benefit only a handful of large firms.

There has been six times growth in Internet of Things (IoT) patents in India over the last five years and more than 80 per cent of these patents were related to applications pertaining to Industry 4.0, with the healthcare and automobile industry leading the way, a Nasscom report said on Friday.

Nine months after Reliance Jio entered into an agreement with Brookfield to sell its mobile network towers, the largest FDI in Indian infrastructure has not yet received all regulatory approvals, said people aware of the matter.